Style 31 couplings are designed to provide a strong component for ductile iron pipe systems of AWWA dimensions

The Style 31 coupling is designed for use on radius cut grooved pipe with minimum wall thickness of ANSI/AWWA C151/A21.51, Class 53. The Style 31 FlushSeal gasket is specifically designed for ductile pipe surfaces and provides an efficient triple seal

The outside surface of pipe between the groove and pipe end must be smooth and free from deep pits or swells to provide a leak-tight seal for the Victaulic gasket